Progressive rate spring for a suspension



FIG. 1 is a perspective view showing the top, front, and left sides of a suspension spring having the inventive design;

FIG. 2 is a left side elevational view of the suspension spring shown in FIG. 1, and the right side elevational view is identical to the left side elevational view;

FIG. 3 is a front elevational view of the suspension spring shown in FIG. 1, and the back elevational view is identical to the front elevational view;

FIG. 4 is a top view of the suspension spring shown in FIG. 1; and,

FIG. 5 is a bottom view of the suspension spring shown in FIG. 1.

The broken lines showing various holes in FIG. 1, FIG. 4, and FIG. 5 are for the purpose of illustrating an example of mounting holes of the suspension spring and form no part of the claimed design. 

CLAIM The ornamental design for a progressive rate spring for a suspension, as shown and described. 